One of the much-talked-about features in Fedora Core 3 (FC3) is Security-Enhanced Linux, which some people believe will make Linux a truly military-grade secure operating system. But SELinux is available to secure many other distributions as well.

SELinux started life in early 1990s as Flask, a secure architecture for a secure OS, and prototyped in the Fluke operating system, the result of a joint effort by the U.S. National Security Agency, Secure Computing Corp., and the University of Utah's Flux research group.